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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10c23088eab9d66a5d12adde8d841a32a254ba416d530bebb4a4913df957ab9c' 
  AND token = 'yktiQbbyrjP+pSBgGC9IkA8CjCHNzl6L+x0704YL9Jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}